|First mentioned||A Hero's Quest|
|Debut||February 24, 2010|
|Occupation||Head of maintenance at Yamagato Industries|
In Hiro's third blog post, "A Sign!", Hiro calls Kenjiro to open his father's secret room at Yamagato Industries. Kenjiro tells Hiro that no one has been in the room for twenty years, and that he forgot it even existed. Nevertheless, Kenjiro uses the master key (which only Kaito and Kaito's assistant have) and opens the door. Later, Kenjiro sees a broken pipe, the origin of the water damage in the room.
In Hiro's fourth blog post, "Blast from the Past", Hiro reports that Kenjiro likes to listen to his Django Reinhardt records during his lunch break, so he has a turntable in his office. Then, Kenjiro and Hiro muck out the Danger Room, bring in some air blasters, and set up an area for triage.
In Hiro's eleventh blog post, "Old School Fun & Games", Hiro reports on Kenjiro's pet cricket, Aiko. Kenjiro has looked everywhere for Aiko including crawling through Yamagato Industries' vents. When he found Aiko, he also found an old game cartridge, of which Hiro, Kenjiro, and Ando began to play.